Fix the link to the tekton bundle example

Signed-off-by: Andrea Frittoli <andrea.frittoli@uk.ibm.com>

Author: afrittoli

docs/taskruns.md

@@ -131,7 +131,7 @@ taskRef:
   bundle: docker.io/myrepo/mycatalog@sha256:abc123
 ```
 
-A working example can be found [here](../examples/v1beta1/taskruns/bundle.yaml).
+A working example can be found [here](../examples/v1beta1/taskruns/tekton-bundles.yaml).
 
 Any of the above options will fetch the image using the `ImagePullSecrets` attached to the
 `ServiceAccount` specified in the `TaskRun`. See the [Service Account](#service-account)